The field of pediatric dermatology has been rich in new developments. Part I of this continuing medical education article will focus on new diagnoses and new insights into the etiology and pathogenesis of pediatric skin disorders. Insights into the pathogenesis of atopic dermatitis, new forms of contact dermatitis, recently recognized mimickers of port wine stains, associations with infantile hemangiomas, the concept of genetic diseases being classified by common pathways (RASopathies), newly recognized genetic discoveries in mosaic disorders, the recognition of cystic fibrosis being associated with aquagenic wrinkling of the palms, new forms of epidermolysis bullosa, and genital ulcers in non-sexually active adolescent girls will be discussed.
